alter



(No Model.) v v W. S. vALTER 8n M. H. IRVIN.

BALANCED VALVE.

No. 266,068. Patented 0011.17, 1882.

% flttorney RS. Phnlo-Lilhographur. Washington, D. c.

Human STATES PATENT Orrrcn.

YVILLIAM S. ALTER AND MATTHEW H. IRVIN, OF FREEPORT, PA.

BALANCED VALVE.

SPECIFICATION forming part of Letters Patent No. 266,068, dated October 17, 1882.

' Application filed February 25, 1882. (No model.)

To all whom it may concern Be 'it known that we, WM. S. ALTER and MATTHEW H. IRVIN, ot'Freeport, in the county ot'Armstrong and State of Pennsylvania, have invented a new and useful Improvement in Valves for Steamlflngines; and we do hereby declare that the following is a full and exact descl iption thereof, reference being bad to the accompanying drawings, and to the letters of reference marked thereon.

Our invention relates to an improvement in valvesforstearn-engines; anditconsistsin making said valve cylindrical, with steam and exhaust ports, said valve being incased in a tubular casing constructed in two parts, and of less length than the valve, and arranged in a fixed position in the steam-chest of the steamcylinder, the lower h'alfofsaid casing furnished with openings communicating with the ordinary steam-ports and exhaust-openings of the cylinder, and the upper half of said casing having an opening in it communicating with a steam-space in the upper side of the cylindrical valve, through the medium of which opening and steam-space the upward pressure of the valve is balanced, the whole so constructed and arranged that the valve can be fitted by the turning process and the casing titted to it by the boring process, well understood by the machinist.

To enable others skilled in the art with which our invention is most nearly connected, we will proceed to more fully describe its construction and operation.

In the accompanying drawings, which form part of our specification, Figure 1 is a vertical and longitudinal section of the steam-cylinder with its steam-chest and our improvement in valves. Fig. 2 is a vertical and transverse section of same at line y of Fig. 1.

The cylinder and steam-chest is of ordinary construction, except that the lower half, A, of the casin g takes the place of the ordinary valveseat of the common form of flat-faced slidevalves. The upper part, B, of the casing is secured to the lower half, A, by means of screwbolts 0, and is furnished with an opening at D, which communicates with the steam-space 0, made in the upper side of the cylindrical valve f, to which is imparted a reciprocating motion through the medium of the valve-stem g, which is connected to the usual operatinggear of the engine. In the lower side of the valve are steam-ports h and i, which alternately communicate with the steam-portsj and 7c of the steamcylinder. On the under side of the cylindrical valve is also exhaust-ports I, which are so arranged with relation-to the steam-ports ot' the valve that the exhaust of the steam-cylinder will occurateach movement of the cylindrical valvef.

It will be observed that the steam-cylinder takes steam by the valve and its steam-ports projecting beyond the end of the casing. In all other respects the valve works as the ordinary slide-valve.

The advantages growing out of our arrangement consistin ease and simplicity of construction and its balancing property and facility of repair.

Having thus described the nature, construction and operation of our improvement, what 

